To provide a water purifier in which residual chlorine is removed and furthermore a large quantity of treated water is secured with simple constitution.

Feeding water is passed through a ceramic filter part 13 in which far infrared rays are generated to activate it and to ionize residual chlorine in the water. The water is passed through a copper made filter part 14 to combine the ionized chlorine with copper ions and to stabilize it as copper chloride, allowing the residual chlorine to be removed. Furthermore, the water is passed through a mineral filter part 15 to combine remaining chlorine with calcium ions and to stabilize it as calcium chloride, allowing the remaining chlorine to be removed.